compute + -er

computer is on the Academic Word List.
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The Simple English Wikipedia has an article on:

Word parts

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Pronunciation

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Singular
computer

Plural
computers

 
A computer
  1. (countable) A computer is a machine that helps you store, organize, and use information.
    If you're looking at a web page, you must be using a computer.
  2. (countable) (old, no longer used) A computer is a person whose job is doing computations.
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